This study was undertaken for the Center for Applied Linguistics to survey and analyze its information system program for the language sciences. The study identifies and defines the generalized sets of parameters required for subsequent quantitative analysis of proposed alternative Language Information Network and Clearinghouse Systems by means of mathematical models. The report describes the descriptive and evaluative models characterizing the information system in operational terms and expresses the relationship between measures of value or effectiveness and cost, and the chosen alternative designs. Variables defining alternative systems and parameters affecting system effectiveness are presented. The structure of the descriptive model characterizing a generalized conceptual information system is drawn. Variables and parameters of the system user community are described. Characterization of information elements and processing from real-world inputs to service outputs is developed. Cost parameters required to evaluate system operating costs are presented for materials, processing and communications. A summary list of symbols follows. The report recommends specification of system variables, design of data forms, data reduction, development of an evaluative model, and tailoring of a descriptive model. (CHK)